During the past two decades, the National Rifle Association has contributed more than $2 million to support politicians in New Mexico and Texas, where the nation's latest outbreaks of gun violence occurred this week.

Data pulled from Influence Explorer, a Sunlight Foundation database that tabulates federal campaign contributions from the Center for Responsive Politics and state contributions from the National Institute of Money in State Politics, illustrate the extent and depth of NRA's influence. While there are other groups that advocate for gun rights, the NRA by far spends the most on elections. In contrast, gun control groups contributed a relatively modest $40,500 supporting politicians in both states since 1990, Influence Explorer shows.